SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46ac40162283221a4476a61f6928f139b0f666f07bcc14b61f87a6f009233cc' 
  AND token = 'Cekpk3q5/RuwnGjMI01vyLvhM2jK9CWW+qyW/JCLUZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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