Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bd2ea4e9bffb18331b8568483b314f20dbe4adde3977efc55c834b9f2a803b' 
  AND token = 'VTlQuXT/SaP+Yn6b4MvXV2yo+tsdXa22LMAhMWEYxcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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