SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f7cf823d017636db64ab22d2ee5c23d488e22660c1b5397793def8c5d9ae91' 
  AND token = '/ZCq1q5HWYDgo6aQJtFwmiIVtBNwKeEyTDJb+Xh1YEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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