SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58de955b880834c4f1207e1ceb5a8a81204ed5cf395e9f1b25b32e713bd02b06' 
  AND token = 'Hx2l2zXVjcZfywORRj+q2NGpf4ruZaKY3iM6X4qI+og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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