SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af839c6558ac2266357b5c967bd558e63fd4e535eb9b015f718b220c1e92787c' 
  AND token = 'HL1O4Jg/n4VpKxzbdISUhC9OPaZB+B/z5m4MedlaGVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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