Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6962c0ad97107b49aca63eef0c30d23231a0df36b2aead271773c6fd997c1d1' 
  AND token = '/3vakC+65yfO31hxsSfByKCZHo8BMKxrj4Xu/fNSS10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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