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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b0cdbeee23be3b5c9e98e43c05849ba30ec27788d3f1d35d6835c50bd504b2' 
  AND token = 'dMgASkrvWFFk5zqk0tSgdqKqTqSn5+RBJbOrcpDfrAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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