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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9500b99145e3be41368ed582d00cfa09166698f93c413d071a86d27664a04007' 
  AND token = 'IYI8V1xEDE+7ogW87+TUAim9VmVwreT37phy1PY+oq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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