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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813570edc13f44853fe5975ef32d4c24b7da5713a32d5e06deb3ccd1c16bf4a8' 
  AND token = 'VtI+g07hxks0Envf5s0XNIGbjROQx2emxtRXMLOcnsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}