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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30010f7de4173098504b058fd65ed384074e45b8b7fd3d6b1ac8c59ca7fe68c2' 
  AND token = 'lPSJdJBzXptydDHq4AJTKc6E3AxEYUWfV7pS109btus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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