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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b79696dd865442e278532beafa449d67973355c58820e1f0a43f6a4a5bcd426' 
  AND token = 'IYOoyzNddlmLKj/c5DC3BiDeI9zj2Ez8lFkrwzT+38Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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