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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c17a69f982ad02b3bd8d0519cea57dac87550cada89914a624b6d87bcebf09' 
  AND token = '/h+3lOWN+S56cbuEMXNjzEeGzV69wg6ox+cBgmZZy8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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