SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2741b85d935bae40320b6f310737f7acfc3d4469d9936fb28d29acf0283e8855' 
  AND token = '3XPOXUFBibPujZ/Qtzpp7YBVAoxLs+OXFLT3O11C4RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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