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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85877ca8fdf539ce471abe4f1ba73449257d07b8b002c4511c9b79511d24575' 
  AND token = 'wS3ZaZ+FdEgq35cuVRzFMw3i/RB5HlZKfxnmWQXLdS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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