SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8d650be4a9cd17c7e597526ee42da1bc4ada6b5e249aef1cf3800a375fb844' 
  AND token = '+Q7cOkj/dMpEyRqm4hDsZAwDBxuLTJnsOBYwFgWMwQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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