SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d5a2a955c453395c20e2ff6e829f03661da4d3245bd58b1b11dcb79fb71603' 
  AND token = 'o72jDuf+I/tjBOTjI4FyKJKq6UCgpCTHbj/Eq2+/4lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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