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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a1864f336374dfb0bdc1d954bce1e9f658df89bdf90319eb0865679b403f87' 
  AND token = 'NKhWwhM8oMoLdHQMz7o6qV+fFKy+eG/05R93Y5iu8FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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