SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a153ef357358d6f589153390d51a96d7074a01c827b340d6b926db889afbf84' 
  AND token = 'XyRDww/QMhh8sGl/p0aMTOjdNqKEs8UVEaKLRGxfWZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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