SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1e294dd22f3718ef4afb441e4d19ccdc7757a0954b392dfdab564168f61b1d' 
  AND token = 'OlOAn+K2uHB7whIUlY45oCDuWE7zvRzs2eBcsg5gSEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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