SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280c2364d474706ede20c18be37999715b2286df3ed8847c19d3e56c347f10b0' 
  AND token = 'cGgkvL/P+cPHpBJmR9RSJqqCDz5wpCUpMxS3+X44Bl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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