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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad1a2e56f77ed00de8a37a22d533a9e94919730a65a6f41141e55ca75d84b7e' 
  AND token = 'DdzgLi+28ZzK2yxhogwerLc6ytkkyI6C8bi2vqur+/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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