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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb030b6fec6e931922922409ca36b0bd2f435525629dcadb0c8f196f846f379' 
  AND token = 'cRuj7QQM+d2IOvvv8ftT82VTRcxtQbRWWkb5NmkeFT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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