SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1219b0aa3ac4375899d1c6a20ec3fd7635926a1f546e6c1cfe27636c4049ba' 
  AND token = 'ggEDieGbCFK4hR6J+vhYQ2HNsZW9eeEzj3bX+vn+jXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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