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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05f60a8001e4f18efccfb61bab1ce95acd6a0f202c516539100713dcebd8d23' 
  AND token = 'KWDhPJGvpszTMhn+7HEwYNzVEeMWN9uD10fyhAPq8VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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