SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a25f183f4197101b3688da4a3d3e38075da4c946de9d368cd413fc588eab7f' 
  AND token = 'Phfx3FMyInAkYwNnbyJJTmM2PQmvSyqzKwrMHomuD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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