SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893b745f5813bbe71a347912e0780e436cffcffe2ddcf84f2b83b235fefd4e17' 
  AND token = 'KrRqtO+2eoZjKQB6yHQIKedqUGfg5Oo4lprq/nFmMJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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