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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5223599146914191fb6c18ed909fff96df599cb3648b3cb2f1a153af33f87a9' 
  AND token = 'pUh87po/u4xY5KRzXuDx+ZhxP9Uldi+9Q1eacy4V1O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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