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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee64728098d7d277a91c5517143116706e1d65ecf3094f44b76e0b198a56a21' 
  AND token = 'b17Cy8SXrUxxDFDn9iKRxRt8dUR2Ug9nP3bWWd29c1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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