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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afc10122214b6bbf7d2427de400643561ba3a540f45bc421dd605e143c91426' 
  AND token = 'd5BgJeBA+Nd2rH544Uo1zo0R7NhNhWCl0mOzanKrHRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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