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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f984f1a334a69db0e28d9695d4853fd41ae902ceaa81b93bec78292ae4c5ec5' 
  AND token = 'tdAgF0AUZevRd8KJtLhYZZj1sLGJLjPRFc0OIgK0yM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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