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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a599659755d77506c26bf08c0ee55dd17c34c3e32486dd418d69701beeb56d73' 
  AND token = 'pdU2h8YqlXu4PNGCFT9ARapoqXGpUpf1Jr7guAg/yDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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