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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8617e1c9d3e4fea7b057bd0740e2e098b5a8c9afe630d5bd9255f8cb460363c4' 
  AND token = 'rsHQqRTC04daAADh8qiVfO5bFsB9ivPFjwe875sEQAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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