SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4baa04f9328cc54fc2ad61319525eb14c047cd26868d0b8326272e25b31cc1' 
  AND token = 'GvLI/5KdaaJIFojCpHM6QaEomZgpjqATBOLDTZwiZuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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