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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354b7d9b68f18d0c0973dc4a31fb7d7945f5f03a31a1c76ead6af8bfea9cb771' 
  AND token = 'o3MCpxA/5KPH25+tO5VNvwU7uI4dNeVjtcL67XzNUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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