SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be058bddfa7bf859137c30658894aa39a7d9b6b888e3082dd54ccdd65c69ba3a' 
  AND token = 'yB7O2zjiGUlvHenpfs2QZdGDuXNNunSU6HDCgLJBnYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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