SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a07d5485181af122fecd34c2bb9917c705da728df159727617ced60e1285d1' 
  AND token = '/9I+aTgCegidlriwyPgG9/zmVF0ByIHu+QUv4tlRKQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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