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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409fa3fbe83762b2a77ab17c962bdb3e3374922d656c2ac4f45f01137989d781' 
  AND token = 'fO+vbH1iimqopejweL3gaCCuot/dwF5ogFJ8lpdlF9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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