SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d24477e34108acff86bbffc2599dc10f46bba572d9bc355d7283f9f205a588' 
  AND token = '3aeHjXigGxfYO2OVzOlAULH7LE+rogqOEz5pjwl7pvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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