Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c951ca1702c22382c31ce0e37cfac5bb7ffab3a5b82e17efe81057519ab9054' 
  AND token = 'oKlZZQdHKJdn2ngX1McFLxzUkIsxVBSja+wwWDAW/Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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