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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe9267c882f6c383a7d06701523c31531bb63495f9afc950d8fe5575e97d55c' 
  AND token = 'EeN1GDsTB3SP54QcsikgN3K3UZXaarUAG6unm6bziDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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