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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98133b8228d5e03b7e7f2a74c61c7d1457e779ea798d0cb787042c4534140c28' 
  AND token = 'Bw9GwfOUQXs7Xm6qONghK+oBQMqIS6k2kTaBd2d+twA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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