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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e3b1e203fa8f029d388f1eec915451ba3c9431d6bacfff13fbfa0c6f0dc565' 
  AND token = 'hZe8jqWxq+53wkV/Kuriaeh8AuHzu9pqBNJk9Tn7Tiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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