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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0153a4fe6bc235a72d12fd95ffd4afff4fac9156ebd8601c0e424561ea4bead0' 
  AND token = '40lTP9QCBvyIcmmfeIp6Lh7fgrOiMrxYBYwe5qBhBQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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