SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3951099f33847fe4cebf98a386a9c77f018581679f45b62d4596b3536b8c4179' 
  AND token = 'ZPyqFPru+Sbp5n9mPgx3yIWwqs2YS0/3ll6Gc6qxnVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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