SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6025d732e267b9bb60b4ef05cb5292231c3b56be669d1830489ae59dc7c8a6' 
  AND token = 'zDwJvI/ZctXUiDyBKQdhmveheiAnCH+6jH6/MKAYMHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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