SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f324c12ddcd58e8b264e947cb10262c5bcf98f99a09b88df68706c9cddda07' 
  AND token = 'wncIA8aJsG0Jt/tIQY8hq/0KSOUhZRjC/oG1VVSFmVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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