SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff793a2f914b5cb6d6fa5d31321de9552dd1ba814f6d14490204096c80fd9aba' 
  AND token = 'awZ6xeqtkgZJ8Up6/HKMD5P/yKuGms66BgB6Buq/dxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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