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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ce6ef7d29c1e7f62470cd50a2e96b473f997999baa8c8ba311e95d454f29ea' 
  AND token = '157xMwuLsu/UjuYKqsoRmccYt8+tdDtwmwKoRxaI698=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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