SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1379905b8af1fda456933a8541eb412a592851370b3491fad31ed62fe9cbeec' 
  AND token = 'HreLX6e94fvIlXfDYuZju/QjGxsg2iJ51vuUfDVCNwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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