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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bc35348ef703736cb82aea3d2d91a19ce8b0a740f89c2e0cda78f14d74c6b4' 
  AND token = 'GKmybyrCI+4fC7WQGiUch5/zK7qqN8tjvC0sikI/nyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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