SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886f6d142f4bcb86c94f7a9a15f3403de48205d63e46b6e7cdb13d78c2696070' 
  AND token = 'IVIwDLYPi6XB97Bh6sHPv+U1Zef7z/z5Wo94LuhUTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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