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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8320368fbe31f79d10cac5c8e742e631db244446916b7a4a27894c77eed853e5' 
  AND token = 'l6x0lUKs/NcI5zkGpCQHPgZTb5fAZ9qGp9h36lX5uUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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