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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8b3d97a8fde068b49db1d0404a0a9f1648dc4725c2cb6b728cd5c6db83ebc4' 
  AND token = 'RQWjahtz9riswwmSVao4mDF7POsT7bJNG3NufVhjiH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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