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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06324017dfc3b742a83e330848333850c19292aaf1a58e00ccd0e3c4f6b9617d' 
  AND token = 'ihiUBzip84pmGyEYYfMY9v/gmlkNfaaTPGc6EuRl/+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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