SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca3752db5bfca4e861e342b588c82161818f069a3cba1877a8ee9e433a76daa' 
  AND token = 'TVjXILUBQ32GfIbJKF3w/WLkYV4+5i9nJscz+0/voe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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