SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c35194a7943e45442524bf0b35631aff27e860eba5e2eb3f820e4e8103cd526' 
  AND token = 'QvQkX11gsm2qnswj36RclWSOZuPEdHVjzs/P//9uCtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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