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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2770f36314acc4eb7faa90b33340a53408d19ff4cace6c5b914ae59dd3f5077' 
  AND token = 'gJ5HHuA9v5lwNJLSkhmIdKbopVWsMGGHyWOoBmQQ7B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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