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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b59efe9b23b001ed582c6fea593715d938115f35e153d9b9b90066dc3e94430' 
  AND token = 'YdEmVKmzwzkFApjftDwbvXsMuJhQXBFly5AdPzfQKvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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