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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ee02f6fee2ed8b8891caef64e1009091fd8187f696eb38c1322326235cc08' 
  AND token = 'lAjvcQg+deui6MxC3cehij4R8zxe2VgtRb6J/cl5p7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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