SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b185943706446f3e9a6fb7b6e78a066b05cd1fa10cb9f53985451dd31612ebc0' 
  AND token = 'TqpyoHVjfzyhicW81vO1K7GCgW2OLMEEUR2ewIIBwRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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