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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2837032caec234d9a7952e7f5303805cb84ea5c95fdfb14aaf7e42dff09a9306' 
  AND token = '9rEjpAjyaNWiIS0XVYXwWifwjN61IBcRcisR5YgXz9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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