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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d02762ae657f3d204a7a07dc09175fb1cbb1b6a753c57de7330c070f6af4cb1' 
  AND token = 'KdjHmiG6wjsB7u15QyDOQRXMSTG6Xwm/LMm9bYuMm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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