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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0293cee4bd3b468b6ae8394e94f29cba9404cf9a4db1a042c7e43e07ed5bea3c' 
  AND token = 'ualS5T87GiwWM0YHIz+vJNPUEuWPU9r2OjD9sx7Ci/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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