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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6809b63dd3f53624e6ee796d31afccd9501ad3f2089a6ca6084cbd4b14e31aca' 
  AND token = '30H3Y6VgN3BsIBuOSHq6xfaCRnuVIgsh5XKVX8AXZ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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