SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037ed67dda98f831b6ec727929481af9acb6978bb4ab8ee4573456575b83bc4e' 
  AND token = '5G/CL+jkFoWHeC8XH/MXp7Y2lgwva/qHP61zGpajMIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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