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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc848eaa5853dca55cb71b9ae32f89a2ae76a98c5da28f44e92d8a503176bde' 
  AND token = 'FF19rJ8Qlv5yZ9JaL89DSgrtKUBwF7U97UPmAqFJ6cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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