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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea812b2e029a6a4a9949cd2cca26aed67e77d4a9b04682404fa540f7170acff4' 
  AND token = 'YzzavM9aCTGKTVb5XwXHnUqV0yeSlor2BWiJN4vWXm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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