SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b116edb5cadc612f56b573fe1ba480c06e2e884686e341d47594ab6267e79f' 
  AND token = '/w8bqjgsx9OqWuIu9fzQSHkYmD8MZBenNqmKaDCwacE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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