SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2391022a5317f5eed0d431cf56e43e726a0882219c55c9bd47e5b5b71958c97' 
  AND token = 'qiOvtqF6wlfYA1SxTx1LQp9663h5vFZj0/BFmvDXAko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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