SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d50fc36f48918e7be72e3de09e2b68191a728ec7d75cc52991beccdd59bd863' 
  AND token = 'OfaqmB7yK27hJI6VHZX85tOhHgV1TG/YLiP6jbOPd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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