SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6087604867a4da039893f9b5db55377619e785e35d1ce5d3abf231d40316f325' 
  AND token = 'IgKq72PmU/LisB0EZo/rWkYFazL6nJVGP0u6paIhOGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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