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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b5733d9564585adb07cf833b7841bd9ed5f528af3d19934f3e1f52d3cc10db' 
  AND token = 'OkYHhGFL0gPIcXsK2GzRUW06Nkt7cK4tgSU6H0LM+Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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