SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185a98d9f17a0c6938a6430266f5fa6b1a88730b15ee2202a7323782694dfd63' 
  AND token = 'YD/Zpg9+E521mo6Dm6uAPVU4RITVHLCIO3YXpYrWw/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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