SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf5840d4865506727a77b3fae6389bb2b274377c7bc46dff5ffefa681124835' 
  AND token = 'XA2Qoxh39Sg+OukXZEsEJRLxjv1VGEwgyO1rVgXvwcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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