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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c1bcbc73f193180d73776bea43645c28d034d3d94fc2bc0672f9834a271b9a' 
  AND token = 'QZbOvZZOf+Bjbv7DDZrjv9UVI0pVBwOzVv0N7xTj1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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