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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd83cc124af854434d2fe54ddc11dc29d8b5188f3cbd8a87bbdc38f30ec9b30' 
  AND token = 'YnzUXsilM8deaWvYaSipXgDQvs/zirZL8idLwltrc0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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