SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad1217953f7b3bb810fe9c6c83d1883a5e2e6cf426214c2f48a882fec7a03f5' 
  AND token = 'UVgd6PoU/Q58OJOBMZM/IF9TT6qWRCpoKahsVPb9eiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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