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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56884279c0ff2fa10a13d9a350c6bd3bbc6f060661ab65484cd468ee5bb3c65d' 
  AND token = '9DXJBH7jiD7k42aEMMC9GNaTmYK0JFQIED0GAB82FY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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