SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725fb487d6367ed9159b739caafc007d6c002b56bbe6f41dd87204932f9d1c35' 
  AND token = '25pVKsDW/4ojtqiIfMr8voLpkB0yDwp/PlWBV4HpHKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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