SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10d9a8a29a96463166c68a3c87165b2851c0508befdcdd36b3290ad6f47400e' 
  AND token = 'twa2EJiqFvuvL2CLjti/IGKVXFtWHpoQ3GBlVG6jTWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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