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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfa6dbb4b67b3f9336ff03ebefd29091c948d8e5e14dc6401dc09a7c6be09bf' 
  AND token = 'lz8Ypyum9uHuHdX1fxUtXS11ITGR0QpnpXUbenaU7hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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