SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26f551d296e9468f2bcd3954007e77501a4cb15c9b6f9e3d6dc85b6a8004c1a' 
  AND token = 'TerVBht2+muYNV9PviZjOiwYR/OSWWLG1yBGKT8gxpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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