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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825b6d8e411d21e7c3a1b97ca2d101db7f3f59fcbe7eefa1b766346f3c619e03' 
  AND token = 'fXRVufuqG0uw15+iQuRyV4APhv8h+xqIXj89876d6Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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