SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354106205c34efdbbe7768eff21dbc785e4f2f95186dc4bce03fa5f3f6f5bd10' 
  AND token = 'Jipkk01CPtHMaTYOvqFQpmovrCg9/6G15TKlIVAYyBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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