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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32f3b1111e30167e7179b90e0b7444d2b6e1e00dfd801196317467d72a6a44b' 
  AND token = 'Y1TC+V8f87zc2eXwAOEGZ4eR+Ka0garCj5t4P1qdcfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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