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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeec3fe3bea69f3b871c321e4a948635f86cba6d22e53d6a299b7d396ce39a16' 
  AND token = '7T8WXfAQb3paTnRrJAvYoEQZ1JMlf0XtjDszmRbpLcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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