SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f47ed78d737ed50338a4517a85f25c825e8f734e01b47bf995d658773bbe921' 
  AND token = '31DR4zvgkElU7CYTMJQSMBhxvAs7XG63ShBHPh1OZ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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