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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef82ee385c8f430ed29aebc9ec6eb8e88bce154409a74689ca914d4bb8cbf70f' 
  AND token = 'tvGoroG8cIn3zQV1HCfBHU+OTW9+nl++70P9DEcrHFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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