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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736ca5fc090c8f7e7ae49b12e49b0631013c4d5f81cd2eb4a6cc62ce60002b9' 
  AND token = '72M5QD9Plli668ggqjUuISk+IwDay9lKDpEOhBuWU8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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