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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033b69faad8f6ddb90e2936ba7df38fe439417f1a1c13f53053781ccec26e9c0' 
  AND token = '9rwYSFIXq5D0ayOuZprVtcaB+x7fKxTAe7b15kaVc+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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